18136209 has 32 divisors (see below), whose sum is σ = 30736384. Its totient is φ = 9253440.

The previous prime is 18136207. The next prime is 18136211. The reversal of 18136209 is 90263181.

It is an interprime number because it is at equal distance from previous prime (18136207) and next prime (18136211).

It is not a de Polignac number, because 18136209 - 2¹ = 18136207 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18136207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7392 + ... + 9534.

It is an arithmetic number, because the mean of its divisors is an integer number (960512).

Almost surely, 2^18136209 is an apocalyptic number.

It is an amenable number.

18136209 is a deficient number, since it is larger than the sum of its proper divisors (12600175).

18136209 is a wasteful number, since it uses less digits than its factorization.

18136209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 18136209 is about 4258.6628183034. The cubic root of 18136209 is about 262.7335318604.

The spelling of 18136209 in words is "eighteen million, one hundred thirty-six thousand, two hundred nine".